James scull



(No Model.) J. SCULL.

MANUFACTURE o? GREEN SAND 0035s.

Patented Apr. 15; 1884.

"mum

III

Zr: 063 M a. Penn Pllubulhampmrfwashingwn. n c

NITED STATES JAMES SOULL, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF OXE-HALF' TO SAMUEL VANCE, OF SAME PLACE.

MANUFACTURE OF GREEN-SAND CORES.

SPECIFICATION forming part of Letters Patent No. 296,880, dated April 15, 1884.

Application filed March 6, 1884. (No model.)

To all whom it may concern:

Be it known that I, J AMES SoULL, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain ,new and useful Improvements in the Manufacture of Green- Saud Cores, of which the following is aspecification.

My invent-ion has for its object to form solid,

hard, and durable sand cores for casting, and to edect the construction thereof with rapidity; and my invention consists in the mode described hereinafter of packing the green'sand with great force upon a revolving mandrel 1 so firmly as to secure a core of the desired hardness and durability.

lathe drawings, Figure 1 is a sectional elevation of ainachine by which the cores are manufactured. Fig. 2 is a plan view, the hopper removed.

The solid or hollow and perforated mandrel F turns in suitable bearings above a sand-box, J, and is revolved by means of a handle, a, opposite the end of a flat tube, E, equal in width to the length of the mandrel, and extending from a wind-box, G, into which a blast of air is forced through a tube, L, by means of the fan M or other suitable blowing apparatus. Above the tube or wind-box is ahop- 0 per, 1), which communicates with the tube through a narrow opening, an, at the bottom, regulated by a slide or valve, n, and above the hopper revolves a riddle, G, into which the green sand is put, and through which it is 5 sifted into the hopper. The sand falls from the hopper in a regular thin stream, and as it enters the tube E is struck by the rapid current of air forced forward by the blower, and is carried with greatforce against the sides of o the mandrel, and densely packed thereon as the same is revolved, a knife, A, trimming down excrescences until the core is of the proper size.

' I am aware that cores have been formed by I 5 dropping the sand upon a revolving mandrel;

but this means of projectingthe sand does not pack it upon the mandrel with sufficient density to form a core as hard and durable as is required for many purposes; but an air-blast projects the sand with such force upon the 0 mandrel as to form a hard solid coating, better capable of withstanding the pressure of the molten metal than a core built up by hand in the usual manner.

The use of the riddle G prevents the introduction into the tube E of large pieces which might obstruct the tube and interfere with the .formation of the core, and also separates the particles, so that they are carried by the airblast without contact with the tube, and there by prevented from adhering thereto. The riddle is revolved from a shaft, (1, by means of a belt and pulleys, and a hammer, H, is vibrated to strike the riddle at regular intervals, so as to loosen the sand from the sieves, preventing the latter from becoming clogged To regulate the force of the air-current the box 0 is provided with an opening covered by a'slide, p, which may be moved to a greater or less extent, to permit the escape of a portion of the air, and thereby reduce the pressure in the box.

It will be obvious that the air-passage may be supplied with sand by feeding'it in any 7 1 other manner than that described that will secure the introduction of small quantities across the whole width of the passage in a regular manner. v

I do nothere claim the devices herein set forth 8o scribing witnesses.

F MES SGULL.

W'itnesses:

WM. H. Vance, EDWARD BLANOHARD. 

